A facile, direct approach for the selective conversion of dithioester to ester functional group has been developed. In/I2 in methanol efficiently promotes the interesting functional grouptransformation at room temperature. Applying the newly developed mild conditions, a series of α-allyl-β′-oxodithioesters have been converted to the corresponding α-allyl-β′-oxoesters in moderate to good yields. Interestingly
已经开发了一种简便,直接的方法,用于将二硫酯选择性转化为酯官能团。甲醇中的In / I 2有效地促进了室温下有趣的官能团转化。应用新近开发的温和条件,一系列α-烯丙基-β'-氧代二硫代酯已以中等至良好的产率转化为相应的α-烯丙基-β'-氧代酯。有趣的是,在转化过程中,起始α-烯丙基-β'-氧代二硫代酯的二硫酯基团被选择性地转化为相应的甲酯,而该部分内的其他官能团不受影响。因此,在合成转化过程中不需要繁琐的保护-去保护。
Apparao, Satyam; Bhattacharjee, Shakti S.; Ila, Hiriyakkanavar, Journal of the Chemical Society. Perkin transactions I, 1985, p. 641 - 646
Regioselective Synthesis of Dihydrothiophene and Thiopyran Frameworks via Catalyst-Controlled Intramolecular C<sub>γ</sub>/C<sub>δ</sub>–S Fusion of α-Allyl-β′-oxodithioesters
A highly efficient and atom-economic dual reaction manifold has been developed to synthesize 4H-thiopyran and 4,5-dihydrothiophene frameworks via regioselective intramolecular C-S fusion of alpha-allyl-beta'-oxodithioesters. The ring size of the sulfur-heterocycles has been efficiently tuned by the use of two different catalytic systems. Palladium activates the Cd-H of the allyl termini and facilitates the intramolecular C delta-S coupling to furnish six-membered thiopyran skeletons exclusively. Conversely, the allylic double bond of the same substrate has been activated by to promote the C delta-S cyclization leading to the formation of a five-membered dihydrothiophene nucleus.
APPARAO, SATYAM;BHATTACHARJEE, SHAKTI, S.;ILA, HIRIYAKKANAVAR;JUNJAPPA, H+, J. CHEM. SOC. PERKIN TRANS., 1985, N 3, 641-645