Journal
ORGANIC PROCESS RESEARCH & DEVELOPMENT
Volume 15, Issue 1, Pages 64-72Publisher
AMER CHEMICAL SOC
DOI: 10.1021/op100225g
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The process development and the kilogram-scale synthesis of BMS-688521 (1) are described. The synthesis features a highly efficient telescoped sequence which utilizes previously described spirocyclic hydantoin (4b) to produce the final intermediate via an SNAR reaction. A final deprotection step affords BMS-688521 (1) in high quality with an overall yield of 65% from the key intermediate, spirocyclic hydantoin (4b).
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