Intramolecular double Michael reaction of the α,β-unsaturated enone ester (16), prepared from the dienone (5), stereoselectively gave the tetracyclic product (17), which was converted into the isoatisirene typecompound (20).
ALPHA-HALOTETRAMETHYCYCLOHEXANONE, A METHOD FOR THE PREPARATION THEREOF, AND A METHOD FOR THE PREPARATION OF A (2,3,4,4-TETRAMETHYLCYCLOPENTYL)METHY CARBOXYLATE COMPOUND
申请人:SHIN-ETSU CHEMICAL CO., LTD.
公开号:US20170342013A1
公开(公告)日:2017-11-30
The present invention provides a method for the preparation of a sex pheromone of Obsucure Mealy bug (OMB), (plus/minus) (2,3,4,4-tetramethycyclopentyl)methyl acetate. The method comprises a step of subjecting alpha-halotetramethylcyclohexanone to a Favorskii rearrangement to obtain a 2,3,4,4-tetramethylcyclopentane compound (2), a step of subjecting said compound (2) to reduction to obtain (2,3,4,4-tetramethylcyclopentyl)methanol (3) and a step of subjection said compound (3) to acylation to obtain a (2,3,4,4-tetramethylcyclopentyl)methyl carboxylate compound (4).
ALPHA HALOTETRAMETHYLCYCLOHEXANONE, A METHOD FOR THE PREPARATION THEREOF, AND A METHOD FOR THE PREPARATION OF A (2,3,4,4-TETRAMETHYLCYCLOPENTYL) METHYL CARBOXYLATE COMPOUND
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:EP3248959A2
公开(公告)日:2017-11-29
The present invention provides a method for the preparation of a sex pheromone of Obsucure Mealy bug (OMB), (plus/minus) (2,3,4,4-tetramethycyclopentyl)methyl acetate. The method comprises a step of subjecting alpha-halotetramethylcyclohexanone to a Favorskii rearrangement to obtain a 2,3,4,4-tetramethylcyclopentane compound (2), a step of subjecting said compound (2) to reduction to obtain (2,3,4,4-tetramethylcyclopentyl)methanol (3) and a step of subjection said compound (3) to acylation to obtain a (2,3,4,4-tetramethylcyclopentyl)methyl carboxylate compound (4).