Diastereoselective titanium-mediated construction of cis-2,3-ring annelated 1-(2′-chloroethyl)cyclopropanols
作者:Frédéric Lecornué、Jean Ollivier
DOI:10.1039/b211642a
日期:——
Titanium(IV)-mediated cyclopropanation induced by reaction of cycloalkylmagnesium bromides 1a-e in the presence of titanium tetraisopropoxide with ethyl beta-chloropropionate 2 yielded cis-fused 1-(2'-chloroethyl)cyclopropanols 3b-e with diastereoselectivity highly depending on the ring size. Unexpected rearrangement products 5d,e were isolated in some cases.
在四异丙氧基钛与β-氯丙酸乙酯2存在下,由环烷基溴化镁1a-e反应诱导的钛(IV)介导的环丙烷化生成顺式稠合的1-(2'-氯乙基)环丙醇3b-e,其高度非对映选择性取决于戒指的大小。在某些情况下,意外的重排产物5d,e被分离出来。