Cycloaddition reactions of isocyanates. Addition of sulfonyl isocyanates to carbodiimides

H Ulrich, B Tucker, FA Stuber…

Index: Ulrich,H. et al. Journal of Organic Chemistry, 1969 , vol. 34, # 8 p. 2250 - 2254

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Citation Number: 14

Abstract

The polar cycloaddition reaction of arenesulfonyl isocyanates (1) with dialkylcarbodiimides (2) gives rise to the formation of six-membered ring cycloadducts 6 and 8. The latter compound arises from interception of an acyclic polar 1: 1 adduct by arenesulfonylalkylcarbodiimide (9), which is generated via an exchange sequence. Simultaneous cycloaddition of 1, 2, and 9 forms cycloadducts 6, 8, and 12. Cycloadduct 12 ...