Diastereoselective Synthesis of Homoallylic Alcohols with Adjacent Tertiary and Quaternary Centers by Using Functionalized Allylic Aluminum Reagents
作者:Zhihua Peng、Tobias D. Blümke、Peter Mayer、Paul Knochel
DOI:10.1002/anie.201003813
日期:2010.11.2
Sensitive functional groups, including ester and cyano groups, can be present in allylicaluminumreagents prepared by aluminum insertion in the presence of InCl3. These aluminum organometallic compounds undergo addition reactions to various functionalized aldehydes or ketones with remarkable diastereoselectivities allowing the construction of two adjacentquaternary and tertiarycenters (see scheme)
method for the highlydiastereoselective preparation of anti tertiary homoallylic alcohols has been developed. The reaction of allyltitanocenes, generated by the reductive titanation of various allylic substrates with a titanocene(II) species, with a variety of ketones produced the anti tertiary homoallylic alcohols in good diastereoselectivity, even when using sterically less congested ketones (see scheme;
Palladium-Catalyzed Synthesis and Isolation of Functionalized Allylboronic Acids: Selective, Direct Allylboration of Ketones
作者:Mihai Raducan、Rauful Alam、Kálmán J. Szabó
DOI:10.1002/anie.201207951
日期:2012.12.21
Textbook revision: Allylboronicacids, which are easily prepared from allylic alcohols, react readily and selectively with ketones without Lewis acid catalysts.
教科书修订:烯丙基硼酸很容易由烯丙醇制备,无需路易斯酸催化剂即可轻松且选择性地与酮反应。
Highly Diastereoselective Synthesis of Homoallylic Alcohols Bearing Adjacent Quaternary Centers Using Substituted Allylic Zinc Reagents
Staring from readily available polysubstituted allylic chlorides, a range of polysubstituted allyliczinc chlorides were obtained using a LiCl-mediated zinc dust insertion in 55−84% yield. A highly diastereoselective synthesis of homoallylic alcohols bearing up to two adjacent quaternary centers was achieved using these polysubstituted allyliczinc reagents.
Regio- and stereoselective preparation of highly substituted tertiary homoallylic alcohols
作者:Takeshi Takeda、Hideki Wasa、Akira Tsubouchi
DOI:10.1016/j.tetlet.2011.06.111
日期:2011.8
titanocene(II)-promoted reaction of α-(benzyldimethylsilyl)allylic sulfides with ketones proceeded with high regio- and stereoselectivity to give δ-silylhomoallylic alcohols. The following palladium catalyzed cross-couplings with organic halides produced anti-(E)-β,δ-disubstituted tertiaryhomoallylicalcohols with complete retention of configuration.