整个前列腺素 (PG) 骨架的一锅高产构建是通过铜介导的 ω 侧链单元与 4R 氧化的 2-环戊烯酮衍生物的共轭加成和原位醛醇缩合的组合来实现的。用α侧链醛生成烯醇化物。随后从加合物中去除 7-羟基并解封保护基团,得到 E 系列的 PG。PGE1 已通过五步序列以 56% 的总收率制备。Selective transformation of the PGE to PGD structure can be realized simply by appropriate selection of the hydroxyl protective groups in the five-membered ring and ω side-chain units. 使用 6-甲酰基-5-己烯酸甲酯作为 α 侧链醛单元的邻位 carba 缩合,然后从羟醛产物脱氧得到 5,6-didehydro-PGE2 衍生物,在各种天然
aldehyde or nitroalkene in place of the propargylic iodide affords the C-7 and C-6 functionalized prostaglandins, respectively. This new protocol constitutes the simplest three-component method for the synthesis of various natural and unnatural prostaglandins.
This disclosure describes novel compounds which are useful as precursors in the synthesis of 9-oxo-11.alpha.,16-dihydroxy-16-vinyl-5-cis-13-trans-prostadienoate esters which possess activity as hypotensive agents and/or as vasodilators.
A novel and efficient route to prostanoid intermediates
作者:Jeremy I. Levin
DOI:10.1016/s0040-4039(01)80309-9
日期:——
A novel and operationally simple route has been demonstrated for the conversion of cyclopentenone 2 into prostaglandin precursor 1 via an interesting zinc mediated reduction-elimination sequence.
Stable PGI2 analogs (7-hydroxy-and 7-fluoro-PGI2) were synthesized from the chiral synthon, (4R)-4-hydroxy-2-cyclopentenone, using a three component coupling reaction followed by selective reduction, intramolecular cyclization reaction, and fluorination.
nal via the tandem organo-copper conjugate addition—aldol reaction procedure leads directly to a 5,6-dehydroprostaglandin E2 derivative, which can be transformed to a variety of chiral primary prostaglandins in a stereoselective manner.