Three crystalline components, a new kaurane type diterpenoid named macrocalyxin H and two known diterpenoid oridonin and enmenol, were isolated from the leaves of Rabdosia macrocalyx (Dunn) Hara.Based on IR, MS, 1 H 1...Three crystalline components, a new kaurane type diterpenoid named macrocalyxin H and two known diterpenoid oridonin and enmenol, were isolated from the leaves of Rabdosia macrocalyx (Dunn) Hara.Based on IR, MS, 1 H 1H COSY, 13 C 1H COSY and NOE spectroscopy, the structure of macrocalyxin H was determined as ent 7β 20 epoxy 1α, 6α, 7α, 15α, 16α pentahydroxy kaurene 17 acetate.展开更多
Through further studies, the structure of coetsin A (1) was revised as ent 11β hydro xy 3α acetoxy 6β methyoxy 6,19 epoxy 7,20 δ lactonic ring 6,7 spiroseco 16 kaurane 15 one (2) by 1H 1H COSY, 13 C 1H COSY and NO...Through further studies, the structure of coetsin A (1) was revised as ent 11β hydro xy 3α acetoxy 6β methyoxy 6,19 epoxy 7,20 δ lactonic ring 6,7 spiroseco 16 kaurane 15 one (2) by 1H 1H COSY, 13 C 1H COSY and NOESY.The structure of coetsin C was identified, through physico chemical constants and spectral analysis, as ent 11β hydroxy 1α acetoxy 6β methyoxy 6,19 epoxy 7,20 δ lactonic ring 6,7 spiroseco 16 kaurene 15 one (3).展开更多
Known diterpenoid maoyerabdosin was isolated from the leaves of Rabdosia macrocalyx (Dunn) Hara.Based on elemental analyses and spectra of MS,NMR,COSY and NOESY,the structure of maoyerabdosin was revised as ent 7β 20...Known diterpenoid maoyerabdosin was isolated from the leaves of Rabdosia macrocalyx (Dunn) Hara.Based on elemental analyses and spectra of MS,NMR,COSY and NOESY,the structure of maoyerabdosin was revised as ent 7β 20 epoxy 1α,7α,15α,16α tetrahydro xy kaurene 6α,17 diacetate.展开更多
文摘Three crystalline components, a new kaurane type diterpenoid named macrocalyxin H and two known diterpenoid oridonin and enmenol, were isolated from the leaves of Rabdosia macrocalyx (Dunn) Hara.Based on IR, MS, 1 H 1H COSY, 13 C 1H COSY and NOE spectroscopy, the structure of macrocalyxin H was determined as ent 7β 20 epoxy 1α, 6α, 7α, 15α, 16α pentahydroxy kaurene 17 acetate.
文摘Through further studies, the structure of coetsin A (1) was revised as ent 11β hydro xy 3α acetoxy 6β methyoxy 6,19 epoxy 7,20 δ lactonic ring 6,7 spiroseco 16 kaurane 15 one (2) by 1H 1H COSY, 13 C 1H COSY and NOESY.The structure of coetsin C was identified, through physico chemical constants and spectral analysis, as ent 11β hydroxy 1α acetoxy 6β methyoxy 6,19 epoxy 7,20 δ lactonic ring 6,7 spiroseco 16 kaurene 15 one (3).
文摘Known diterpenoid maoyerabdosin was isolated from the leaves of Rabdosia macrocalyx (Dunn) Hara.Based on elemental analyses and spectra of MS,NMR,COSY and NOESY,the structure of maoyerabdosin was revised as ent 7β 20 epoxy 1α,7α,15α,16α tetrahydro xy kaurene 6α,17 diacetate.
