A general strategy for the highly stereoselective synthesis of HR22C16-like mitotic kinesin Eg5 inhibitors from both l- and d-tryptophans
作者:Jing Dong、Tien Ha Trieu、Xiao-Xin Shi、Qiang Zhang、Sen Xiao、Xia Lu
DOI:10.1016/j.tetasy.2011.10.011
日期:2011.11
An efficient and general strategy for the highly stereoselective synthesis of HR22C16-like mitotic kinesin Eg5 inhibitors 1 from both L- and D-tryptophan methyl ester hydrohalides is described. (1R,35)-trans-1,3-Disubstituted 1,2,3,4-tetrahydro-beta-carbolines (1R,3S)-trans-2 could be obtained in high yields and with high stereoselectivities from the Pictet-Spengler reaction of L-tryptophan methyl ester hydrohalide with some 3-acyloxyl benzaldehydes via a CIAT (crystal induced asymmetric transformation) process, whereas (1R,3R)-cis-1,3-disubstituted 1,2,3,4-tetrahydro-beta-carbolines (1R,3R)-cis-2 could also be obtained in high yields and with high stereoselectivities from a Pictet-Spengler reaction of D-tryptophan methyl ester hydrohalide with some other 3-acyloxyl benzaldehydes via a CIAT process. Both compounds (1R,35)-trans-2 and (1R,3R)-cis-2 were efficiently converted into HR22C16-like mitotic kinesin Eg5 inhibitors 1 by the same one-pot procedure through tandem reactions. A total of eighteen target compounds 1 were obtained from six intermediate compounds 2 in 87-95% yields. (C) 2011 Elsevier Ltd. All rights reserved.