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Communication | Regular issue | Vol 19, No. 10, 1982, pp.1801-1805
Published online, 1st January, 1970
DOI: 10.3987/R-1982-10-1801
Neopulchellin Conformation

Seiichi Inayama, Kenzo Harimaya, Hitoshi Hori, Takeshi Kawamata, Tamiko Ohkura, Hikaru Nakamura, and Yoichi Iitaka

*Pharmaceutical Institute, Pharmaceutical Institute, Keio University, Shinanomachi 35, Shinjuku, Tokyo 160-0016, Japan


Neopulchellin (1) was found to show that the cycloheptane ring fused to the cis butyrolactone adopts a boat conformation both in solid and in solution, in contrast with the half-chair form in the trans-lactone isomer, pulchellin (3), on the basis of X-ray diffraction of 1 and comparison of 400 MHz 1H-nmr and cd spectra of 1 and 3.