Allylindium sesquihalide reacts with epoxide to give homoallyl alcohol via a 1,2-shift reaction. In contrast, allylindate gives the ring-opening product without rearrangement.
Chemoselective Cross Metathesis of Bishomoallylic Alcohols: Rapid Access to Fragment A of the Cryptophycins
作者:Mark Lautens、Matthew L. Maddess
DOI:10.1021/ol049883f
日期:2004.6.1
The racemic or enantioselective allylation of in situ formed beta,gamma-unsaturated aldehydes provides efficient access to bishomoallylic alcohols from readily available 2-vinyloxiranes. These products, when subjected to modified Grubbs cross metathesis conditions, afforded terminally homologated products in moderate to good yields with high E selectivity and without degradation of the enantiomeric excess. The compounds obtained through this two-step sequence yield fragments of an important and pharmacologically active family of cryptophycins.
Indium-mediated consecutive 1,2-shift reaction and regioselective allylation of vinyl epoxides
作者:Byung Kyu Oh、Joo Hwan Cha、Yong Seo Cho、Kyung Il Choi、Hun Yeong Koh、Moon Ho Chang、Ae Nim Pae
DOI:10.1016/s0040-4039(03)00418-0
日期:2003.3
Allyl indium, prepared from allyl bromide and indium metal in aprotic solvent, reacts with terminal vinyl epoxides at room temperature to afford various bishomoallyl alcohols in moderate to high yields via consecutive 1,2-shift reaction and regioselective allylation. (C) 2003 Elsevier Science Ltd. All rights reserved.
Triphosgene–Amine Base Promoted Chlorination of Unactivated Aliphatic Alcohols
作者:Andrés Villalpando、Caitlan E. Ayala、Christopher B. Watson、Rendy Kartika
DOI:10.1021/jo400341n
日期:2013.4.19
Unactivated α-branched primary and secondary aliphatic alcohols have been successfully transformed into their corresponding alkyl chlorides in high yields upon treatment with a mixture of triphosgene and pyridine in dichloromethane at reflux. These mild chlorination conditions are high yielding, stereospecific, and well tolerated by numerous sensitive functionalities. Furthermore, no nuisance waste