Direct alkenylation of indolin-2-ones by 6-aryl-4-methylthio-2H-pyran-2-one-3-carbonitriles: a novel approach

作者：Kumar Sandeep; Pratap Ramendra; Kumar Abhinav; Kumar Brijesh; Tandon Vishnu K; Ram Vishnu Ji^*

来源：Beilstein Journal of Organic Chemistry, 2013, 9: 809-817.

DOI：10.3762/bjoc.9.92

• alkenylation
• dibenzo[d,f][1,3]diazepin-6(7H)-one
• indolin-2-one
• ketene dithioacetal
• 2H-pyran-2-one

A direct one-pot base-induced alkenylation of indolin-2-ones has been developed by using 6-aryl-4-methylthio-2H-pyran-2-one-3-carbonitriles. Different bases such as MeONa, NaH and t-BuONa have been used to optimize the reaction conditions to obtain the desired product. NaH in THF was found to be the most suitable for the alkenylation of indolin-2-ones. Reaction in the presence of other bases led to the formation of 1-aryl-3-methoxy/methylthio-5H-dibenzo[d,f][1,3]diazepin-6(7H)-ones. Quantum chemical calculations have been performed to explain the nature of the weak noncovalent interactions operating in the supramolecular architectures of alkenylated indoline-2-ones and to explain the relative stability of one of the tautomers with respect to the others.

• 出版日期2013-4-25