Total synthesis of natural product | LSPN

1.2 From Biosynthesis to Total Synthesis: Strategies Toward the Natural Product Chemical Space 10.

Total Synthesis of the Antiviral Natural Product Houttuynoid B

N2 - The stereoselective conversion of the naturally occurring optically active cyclitol, L-quebrachitol 2, into antifungal β-methoxyacrylate, oudemansin X 1 is described. This first total synthesis of 1 fully confirmed the proposed absolute configuration of the antibiotic and showed the importance of 2 as a versatile chiral starting material in natural product syntheses.

T1 - Utilisation of L-quebrachitol in natural product synthesis. Total synthesis and absolute configuration of (-)-oudemansin X

Unpicking natural product synthesis | Feature | …

A stereocontrolled total synthesis of the indole diterpenoid natural product paspaline is described. Key steps include a highly diastereoselective enzymatic desymmetrization, substrate-directed epoxidation, Ireland-Claisen rearrangement, and diastereotopic group selective C–H acetoxylation to assemble the target with excellent stereofidelity. The route and results described herein outline complementary conceptual disconnections in the arena of steroid natural product synthesis.

Natural product total synthesis provides a core component of many of the organic research programs

This thesis deals with the development of new reaction methodology, as well as total synthesis of natural products.
Chapter 1 describes readily available rhodium(II) salts catalyzed B-H insertion reactions between NHC-boranes (NHC-BH3) and diazocarbonyl compounds (N2CR1COR2). Stable α-NHC-boryl carbonyl compounds (NHC-BH2-CHR1COR2) are isolated in good yields. The reaction is a reliable way to make boron-carbon bonds with good tolerance for variation in both the NHC-borane and diazocarbonyl components. It presumably occurs by insertion of a transient rhodium carbene into a boron-hydrogen bond of the NHC-borane. Competition experiments show that a typical NHC-borane is highly reactive toward rhodium carbenes.
Chapter 2 describes the synthetic routes towards the synthesis of tulearin A and tulearin C. Large scale synthesis of the bottom fragments (C1-C12) and the top fragment (C13-C26) for tulearin A was accomplished. Different synthetic routes were tested to accomplish the total synthesis of tulearin A. Some major problems toward the total synthesis of tulearin A were identified and solved. Meanwhile a novel synthetic route towards the total synthesis of tulearin C was developed. New methodologies were applied to make the synthesis more efficient. The total synthesis of tulearin C was not accomplished because of the difficulty of removal of the acetate protecting group at C17.

From Biosynthesis to Total Synthesis: Strategies and Tactics for Natural Products


Synthesis of natural product inspired compound collections.

Natural products continue to represent an unparalleled source of new drug leads for human medicine, and are the basis of around 60% of all currently used drugs including more than 75% of anticancer treatments. Of prime importance is the supply of such molecules, and when the harvesting of natural products from the environment becomes either costly, low-yielding, or ethically unsound, a concise and efficient chemical synthesis can provide a viable alternative for supplies of these potential medicines.

28/10/2017 · Synthesis of natural product inspired ..

This thesis deals with the development of new reaction methodology, as well as total synthesis of natural products.
Chapter 1 describes readily available rhodium(II) salts catalyzed B-H insertion reactions between NHC-boranes (NHC-BH3) and diazocarbonyl compounds (N2CR1COR2). Stable α-NHC-boryl carbonyl compounds (NHC-BH2-CHR1COR2) are isolated in good yields. The reaction is a reliable way to make boron-carbon bonds with good tolerance for variation in both the NHC-borane and diazocarbonyl components. It presumably occurs by insertion of a transient rhodium carbene into a boron-hydrogen bond of the NHC-borane. Competition experiments show that a typical NHC-borane is highly reactive toward rhodium carbenes.
Chapter 2 describes the synthetic routes towards the synthesis of tulearin A and tulearin C. Large scale synthesis of the bottom fragments (C1-C12) and the top fragment (C13-C26) for tulearin A was accomplished. Different synthetic routes were tested to accomplish the total synthesis of tulearin A. Some major problems toward the total synthesis of tulearin A were identified and solved. Meanwhile a novel synthetic route towards the total synthesis of tulearin C was developed. New methodologies were applied to make the synthesis more efficient. The total synthesis of tulearin C was not accomplished because of the difficulty of removal of the acetate protecting group at C17.

Natural Product Synthesis - University of Cambridge

Natural products play a critical role in modern organic synthesis and learning synthetic techniques is an important component of the organic laboratory experience. In addition to traditional one-step organic synthesis laboratories, a multistep natural product synthesis is an interesting experiment to challenge students. The proposed three-step synthesis describes the total synthesis of the caffeic acid phenethyl ester (CAPE), a potent 5-lipoxygenase inhibitor from honeybee hives. Recrystallization, flash column chromatography, and circular chromatography were used for purifications. Structure verification for CAPE and all intermediates uses infrared (IR) and nuclear magnetic resonance (NMR, 1H and 13C) spectroscopy and mass spectrometry (MS). This experiment is appropriate for a second-year organic chemistry laboratory.