Relative Stereochemical Determination and Synthesis of the C1−C17 Fragment of a New Natural Polyketide
摘要:
The challenging determination of the relative stereochemistry of a complex natural polyketide portion was achieved. After careful NMR analysis, a concise synthesis of a set of possible relative diastereomers (only 6 diastereomers out of the 32 initially envisioned) has been carried out using a common strategy based on enantioselective aldol reactions. With a high predictability, final NMR comparison established the relative stereochemistry of the C1-C17 fragment of this natural product.
The challenging determination of the relative stereochemistry of a complex natural polyketide portion was achieved. After careful NMR analysis, a concise synthesis of a set of possible relative diastereomers (only 6 diastereomers out of the 32 initially envisioned) has been carried out using a common strategy based on enantioselective aldol reactions. With a high predictability, final NMR comparison established the relative stereochemistry of the C1-C17 fragment of this natural product.
Synthetic Studies on Hemicalide: Development of a Convergent Approach toward the C1–C25 Fragment
Synthetic studies on hemicalide, a recently isolated marine natural product displaying highly potent antiproliferative activity and a unique mode of action, have highlighted a reliable Horner–Wadsworth–Emmons olefination to create the C6–C7 alkene and a remarkable efficient Suzuki–Miyaura coupling to form the C15–C16 bond, resulting in the development of a convergentapproach toward the C1–C25 fragment