Useful base promoted elaborations of oxiranyl ethers
摘要:
Functionalized oxiranyl ethers can be regio- and stereoselectively converted into hydroxy oxetanes or cis-diols by treatment with organometallic bases. These two rearrangements can be conveniently carried out either using different reaction conditions starting from the oxirane or in two consecutive steps from the oxirane via the oxetane. (C) 2001 Elsevier Science Ltd. All rights reserved.
(E)-1-benzyloxy-2,3-epoxyalkanes (4) underwent stereoselective rearrangement in the presence of LIDAKOR reagent and large excess of butyllithium producing (Z)-alkendiols (7) at ambident temperature. The same reaction serves anti oxetanes (6) at −75 °C which can also rearrange to 7 when the temperature arises.
Functionalized oxiranyl ethers can be regio- and stereoselectively converted into hydroxy oxetanes or cis-diols by treatment with organometallic bases. These two rearrangements can be conveniently carried out either using different reaction conditions starting from the oxirane or in two consecutive steps from the oxirane via the oxetane. (C) 2001 Elsevier Science Ltd. All rights reserved.