Process for producing muscone and its intermediate
申请人:Tanabe Yoo
公开号:US20060135819A1
公开(公告)日:2006-06-22
The present invention provides a process for producing a muscone represented by (1) by subjecting a citronellic acid derivative and an undecenoate to a Claisen condensation reaction to produce a keto ester compound represented by (2) decarboxylating the keto ester compound to produce 2,6-dimethyl-8-oxy-2,17-heptadecadiene, cyclizing the heptadecadiene using a metathesis catalyst to produce a 6-dehydromuscone represented by (3) and then hydrogenating the double bond. The present invention also provides the keto ester compound.
Ti-<i>Crossed</i>-Claisen Condensation between Carboxylic Esters and Acid Chlorides or Acids: A Highly Selective and General Method for the Preparation of Various β-Keto Esters
condensation between a 1:1 mixture of carboxylic esters and acidchlorides promoted by TiCl4-Bu3N-N-methylimidazole proceeded successfully to give various beta-keto esters in good yields with excellent selectivities (19 examples, approximately 48-95% yield; cross/self-selectivity = approximately 96/4-99/1). The present method was extended to the condensation between a 1:1 mixture of carboxylicacids and carboxylic