Thionoesters as 1,2-Dipolarophiles for [4+2] Cycloaddition with Cyclobutanones

Yohei Matsumoto, Taro Tsuji, Daiki Nakatake, Ryo Yazaki, Takashi Ohshima

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The utility of thionoester as a 1,2-dipolarophile for [4+2] cycloaddition with cyclobutanones is described. The [4+2] cycloaddition reaction provided tetrahydrothiopyran, which is found in biologically active natural products, in high yield with high diastereoselectivity by using readily available TiCl4. This synthetic method was applicable to a wide range of thionoesters and cyclobutanones. The ketone and S,O-ketal functionalities of the product could be reduced with excellent diastereoselectivity. Furthermore, the C−O bond was transformed into a C−C bond, affording contiguous tetrasubstituted carbon centers.

Original languageEnglish
Pages (from-to)1071-1074
Number of pages4
JournalAsian Journal of Organic Chemistry
Issue number7
Publication statusPublished - Jul 2019

All Science Journal Classification (ASJC) codes

  • Organic Chemistry


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