First total synthesis of (+)-apotrisporin E and (+)-apotrientriols A–B: a cyclization approach to apocarotenoids
摘要:
首次完成了天然类胡萝卜素 (+)-apotrisporin E (1) 和 (+)-apotrientriols A 和 B (2â3) 的全合成。其结构、相对立体化学和绝对构型的确定均已得到证实。这是一种快速、简便地获得该天然产物家族的方法,其关键步骤是非对映选择性环化和 HWE 烯化以连接二烯侧链。这项工作还为合成其他类胡萝卜素(如三孢子醇和三孢子酸)打开了大门。
Palladium-Catalyzed Regio-, Diastereo-, and Enantioselective Benzylic Allylation of 2-Substituted Pyridines
作者:Barry M. Trost、David A. Thaisrivongs
DOI:10.1021/ja904441a
日期:2009.9.2
We report a new method for the highly regio-, diastereo-, and enantioselective palladium-catalyzed allylic alkylation of 2-substituted pyridines that allows for the formation of homoallylic stereocenters containing alkyl, aryl, heteroaryl, and nitrogen substituents. When the reaction is conducted with asymmetric acyclic electrophiles, both linear and branched products may be obtained exclusively by
METHOD OF PRODUCING 6,6-DIMETHYL-3-OXABICYCLO[3.1.0]HEXAN-2-ONE
申请人:Hirata Norihiko
公开号:US20100168463A1
公开(公告)日:2010-07-01
A method of producing 6,6-dimethyl-3-oxabicyclo[3.1.0]hexan-2-one comprising subjecting a cyclopropane compound of the formula (1):
(wherein, R
1
represents an alkyl group, R
2
represents an alkyl group having carbon atom(s) of 1 to 10, a haloalkyl group having carbon atom(s) of 1 to 10, or an aryl group having carbon atoms of 6 to 10 optionally substituted by an alkyl group having carbon atom(s) of 1 to 10, and when R
2
represents the alkyl group, R
1
and R
2
are optionally the same or different each other.) to any of the following reactions a), b) and c):
a) an acid treatment reaction after an alkali hydrolysis reaction
b) an acid hydrolysis reaction
c) an enzyme hydrolysis reaction , then, removing an aqueous layer.