A New and Efficient Synthesis of 6-[(5<i>S</i>,9<i>R</i>)-9-(4-Cyanophenyl)-3-(3,5-dichlorophenyl)-1-methyl-2,4-dioxo-1,3,7-triazaspiro[4.4]non-7-yl]nicotinic Acid, a Potent LFA-1/ICAM Inhibitor
作者:Huiping Zhang、Scott H. Watterson、Zili Xiao、T. G. Murali Dhar、Balu Balasubramanian、Joel C. Barrish、Bang-Chi Chen
DOI:10.1021/op100104z
日期:2010.7.16
An efficient synthesis of 6-[(5S,9R)-9-(4-cyanophenyl)-3-(3,5-dichlorophenyl)-1-methyl-2,4-dioxo-1,3,7-triazaspiro[4.4]non-7-yl]nicotinic acid1 is described. This new process involves an in situ protection of 6-chloronicotinic acid as trimethylsilyl ester followed by coupling with spirocyclic hydantoin core 2 to give the target product in 89% overall yield after one-pot deprotection and final API