Thiafulvenes and Thiafulvalenes in Organic Chemistry: Synthesis and Study its Behavior towards Some Chemical Reagents
摘要:
Trithiafulvenes were prepared through cycloaddition of 3-thioxo-1,2-dithioles to several electrophilic alkenes and alkynes. Treatments of the product with phenylhydrazine and malononitrile afforded the hydrazone and the dinitrilene derivatives respectively. The bromination and subsequent treatment with KCN and malononitrile afforded the diene derivative. The aniline derivative was also obtained by treatment with chloroaniline.
A simple and practical strategy for the preparation of 1,2‐dithiole‐3‐thiones via copper‐catalyzed defluorinative thioannulation of trifluoropropynes has been developed using elemental sulfur as the sole sulfur source. This reaction displays a wide substrate scope and high functional group tolerance to afford the corresponding S‐heterocycles in moderate to good yields and features efficient construction
An operationally simple cascade protocol has been developed for the construction of 1,2- and 1,3-dithiole derivatives from alpha-enolic dithio esters. 1,2-Dithioles are achieved by the reaction of dithioesters with elemental sulfur in the presence of InCl3 under solvent-free conditions. 1,3-Dithioles have been constructed via DABCO mediated self coupling of dithioesters in open air enabling the formation of two new C-S bonds and one ring in a single operation in contiguous fashion. The reactions proceeded smoothly affording the desired sulfur-rich heterocycles in good to excellent yields, exhibiting gram-scale ability and broad functional group tolerance utilizing easy to handle cheap and easily available reagents. The probable mechanisms for the formation of suggested. 1,2- and 1,3-dithioles from alpha-enolic dithioesters have been suggested.
MISRA P. K.; MISRA S. C.; MOHAPATRA R. M.; MITTRA A. S., J. INDIAN CHEM., SOC., 1979, 56, NO 4, 404-407
作者:MISRA P. K.、 MISRA S. C.、 MOHAPATRA R. M.、 MITTRA A. S.