Silicon-Directed Oxa-Pictet−Spengler Cyclization and an Unusual Dimerization of 2-Trimethylsilanyl Tryptophols
作者:Xuqing Zhang、Xiaojie Li、James C. Lanter、Zhihua Sui
DOI:10.1021/ol050623n
日期:2005.5.1
The tetrahydro-pyrano[3,4-b]indoles 6 were synthesized from 2-(2-trimethylsilanyl-1H-indol-3-yl)-ethanols 5 and various ketones or aldehydes through silicon-directed oxa-Pictet-Spengler cyclizations. An unusual reaction led to the dimeric products 7 when some of 5 was treated with acetone using BF(3) as the catalyst.