Hindered organoboron groups in organic chemistry. 21. The reactions of dimesitylboron stabilised carbanions with oxiranes
作者:Andrew Peter、Gina F. Vaughan-Williams、Richard M. Rosser
DOI:10.1016/s0040-4020(01)80394-x
日期:1993.4
Dimesitylboron stabilised carbanions react with oxiranes to give products that can be oxidised to 1,3-diols. The reactions are, in general, under steric rather than electronic control, and proceed smoothly for all but tetrasubstituted oxiranes. Some unusual stereoselective effects have been observed.
Ring Opening of 1,5-Dioxaspiro[3.2]hexanes: Selective Preparation of α-Heterofunctionalized-β‘-hydroxy Ketones or 2,2-Disubstituted Oxetanes
作者:Amy R. Howell、Albert J. Ndakala
DOI:10.1021/ol990039c
日期:1999.9.1
[GRAPHICS]2-Methyleneoxetanes have been converted into 1,5 dioxaspiro[3.2]hexanes with dimethyldioxirane. Reaction of the dioxaspirohexanes with a range of heteroatom nucleophiles, hydride donors, or organoaluminum reagents was successful under neutral or mild conditions, affording, selectively, polyfunctionalized ketones or 2,2 disubstituted oxetanes.