Dipolar cycloaddition reaction of diazoalkanes with trimethylsilyl substituted alkynes. Steric control of regiochemistry by the trimethylsilyl group
作者:Albert Padwa、M. Woods Wannamaker
DOI:10.1016/s0040-4020(01)86680-1
日期:1990.1
coefficient with that of the larger dipolarophile LU coefficient. Dipolar cycloaddition of several 2-(trimethylsilyl) substituted alkynes led to the unexpected regioisomer. Regiochemical control can be attributed to steric rather than to stereoelectronic factors when a bulky trimethylsilyl group is attached to the dipolarophile. In certain cases some of the cycloadducts undergo rearrangement to pyrazoles