SYNTHESIS OF 1, 3, 6, 8-TETRAMETHOXY-cis-4b, 5, 9b, 10-TETRAHYDROINDENO [2, 1-a] INDENE-5, 10-DIONE

…, EN Alesso, GY Moltrasio Iglesias

Index: Bianchi; Alesso; Moltrasio Iglesias Organic Preparations and Procedures International, 1996 , vol. 28, # 2 p. 230 - 234

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Abstract

Our inability to hydrolyze the stereoisomeric mixture of 3 efficiently under either acid or basic conditions and the low yield obtained from ethanolysis of 3 led us prepare 5 as a rneso-a in one step from 4.2 Since both meso and d, Z-stereoisomers of the 2, 3-diphenylsuccinic acid give 7b after cyclizati0n, 3-~ no attempt was made to separate the mixtures. The'H NMR spectrum of the diastereoisomeric mixture 6 shows one signal for the methoxy groups ( ...