Regioselective cyclopropanation of .alpha.-allenic alcohols. An efficient route to alkylidenecyclopropanes
摘要:
Highly substituted alkylidenecyclopropanes are now easily accessible via a regioselective cyclopropanation of alpha-allenic alcohols using samarium/CH2I2. Dienols provide vinylcyclopropylcarbinols upon methylenation.
A novel rearrangement of tertiary α-allenic alcohol carbamates. Preparation of 2-O-carbamoyl-4,4-disubstituted-1,3-butadienes
作者:Richard W. Friesen、Aleksandra E. Kolaczewska、Nina Khazanovich
DOI:10.1016/s0040-4039(00)61758-6
日期:1992.11
Treatment of a variety of tertiary α-allenic alcohols with N-tosyl isocyanate results in a facile and novel rearrangement reaction that provides isolable 2-O-carbamoyl-4,4-disubstituted-1,3-butadienes in a stereoselective manner.