由3,5,5-三氯-4-羟基环戊-2-烯酮(2)制备各种3-卤代和3,5,5-三卤代-4-羟基环戊-2-烯酮衍生物(2),可分两步获得通过(1 R *,4 R *)-3,5,5-三氯-1,4-二羟基环戊-2-烯-1-羧酸(1)从苯酚中得到。共轭3-氯-4-(二甲基叔丁基甲硅烷氧基)-,3-氯-4-四氢吡喃氧基-和5,5-二氯-3-碘-4-四氢吡喃氧基-环戊-2-的加成-消除反应分别用铜酸锂和镁酸镁试剂制得的烯酮(20),(21)和(7)可高产率地产生合成上有用的3-烷基-4-羟基环戊-2-烯酮。
由3,5,5-三氯-4-羟基环戊-2-烯酮(2)制备各种3-卤代和3,5,5-三卤代-4-羟基环戊-2-烯酮衍生物(2),可分两步获得通过(1 R *,4 R *)-3,5,5-三氯-1,4-二羟基环戊-2-烯-1-羧酸(1)从苯酚中得到。共轭3-氯-4-(二甲基叔丁基甲硅烷氧基)-,3-氯-4-四氢吡喃氧基-和5,5-二氯-3-碘-4-四氢吡喃氧基-环戊-2-的加成-消除反应分别用铜酸锂和镁酸镁试剂制得的烯酮(20),(21)和(7)可高产率地产生合成上有用的3-烷基-4-羟基环戊-2-烯酮。
作者:Melvyn Gill、Anthony J. Herlt、Rodney W. Rickards
DOI:10.1016/0040-4020(82)85038-2
日期:1982.1
versatile synthesis of 3-alkyl- and 3-alkenyl-5-hydroxycyclopent-2-enones is described. The key intermediate, 4-(t-butyldimethylsilyloxy)-3-methoxycyclopent-2-enone (5), is prepared in five steps fromphenol. 1,2-Addition of various organolithium and Grignard reagents yields tertiary alcohol intermediates which afford the title compounds after solvolysis and desilylation.
Diisopropylethylamine: An effective catalyst for the introduction of the t-butyldimethylsilyl group
作者:Luciano Lombardo
DOI:10.1016/s0040-4039(00)99846-0
日期:1984.1
The rapid reaction of t-butyldimethylchlorosilane with alcohols catalysed by diisopropylethylamine at room temperature gave high isolated yields of the t-butyldimethylsilyl ethers.
叔丁基二甲基氯硅烷与二异丙基乙胺在室温下催化的醇快速反应,可得到高分离度的叔丁基二甲基甲硅烷基醚。
Process for the peparation of 4-hydroxycyclopent-2-enone and derivatives
申请人:THE AUSTRALIAN NATIONAL UNIVERSITY
公开号:EP0013620A1
公开(公告)日:1980-07-23
A process for the preparation of compounds of the general formula I:
wherein R represents hydrogen or a protecting group, which comprises selective reduction of a compound of the general formula II:
wherein R is as defined above, and Hal represents halogen; with optional total or partial inversion of the hydroxyl or protected hydroxyl substituent; and, when R is a protecting group, optional removal of the protecting group from the compound of general formula 1.
一种制备通式 I:其中 R 代表氢或保护基团的化合物的工艺,包括选择性还原通式 II:其中 R 如上定义,Hal 代表卤素的化合物;任选将羟基或受保护的羟基取代基全部或部分反转;当 R 为保护基团时,任选将保护基团从通式 1 的化合物中去除。
Cyclopentenone and cyclopentenol derivatives and processes for their preparation
申请人:THE AUSTRALIAN NATIONAL UNIVERSITY
公开号:EP0009892A1
公开(公告)日:1980-04-16
Compounds of the general formula I are disclosed as useful intermediates in the preparation of prostanoids:
wherein A represents 0 or H, ORz;
Rz represents hydrogen or a protecting group;
Rx represents hydrogen or a protecting group; and
Ry represents halogen, a substituted thio group, di-substituted amino group, or a group of the formula R2, and R2 represents a straight-or branched-chain alkyl, alkenyl or alkynyl group which may optionally be substituted by one or more carboxyl, carboxylic acid ester, or free or protected hydroxyl, thiol, aldehyde or keto groups; with the provisos that Rx is not hydrogen when A is O and Ry is R2; and that when A is H, ORz RY is R2 and RX and Rz are not both hydrogen.
Processes forthe preparation of these compounds and of 2-substituted 4-hydroxy-cyclopent-2-en-1-one derivatives are also disclosed.
通式 I 的化合物是制备前列腺素的有用中间体:
其中 A 代表 0 或 H、ORz;
Rz 代表氢或保护基团
Rx 代表氢或保护基团;以及
R2 代表直链或支链烷基、烯基或炔基,可任选被一个或多个羧基、羧酸酯或游离或保护羟基、硫醇、醛基或酮基取代;但条件是,当 A 为 O,Ry 为 R2 时,Rx 不是氢;当 A 为 H,ORz RY 为 R2 时,RX 和 Rz 都不是氢。
还公开了这些化合物和 2-取代的 4-羟基-环戊-2-烯-1-酮衍生物的制备方法。
Gill, Melvyn; Rickards, Rodney W., Australian Journal of Chemistry, 1981, vol. 34, # 12, p. 2587 - 2593