On the unusual propensity by the red seaweedLaurencia microcladia of II Rogiolo to form C15 oxepanes: Isolation of rogioloxepane A, B, C, and their likely biogenetic acyclic precursor, prerogioloxepane
作者:Graziano Guella、Ines Mancini、Giuseppe Chiasera、Francesco Pietra
DOI:10.1002/hlca.19920750128
日期:1992.2.5
It is shown here that the red seaweed Laurencia microcladia KÜTZNING, collected in the Mediterranean off the torrent Il rogiolo, contains the C15 acetogenin rogioloxepane A ( = (+)-(2R,7R)-2-(1-bromopropyl)-7-[(Z)-1-chlorohex-3-en-5-ynyl]-2,3,6,7-tetrahydrooxepin; (+)-3) besides its epoxy derivative rogioloxepane B ((+)-4) and the rogioloxepane C ((+)-5) derived from (+)-4 by epoxide opening. Co-occurring
在此示出的是,红色海藻凹顶microcladia KÜTZNING,收集在地中海关闭洪流伊尔rogiolo,包含C 15聚乙酸rogioloxepane A(=(+) - (2 R,7 - [R )-2-(1-溴丙基) -7-[( Z )-1-chlorohex-3-en-5-ynyl] -2,3,6,7-tetrahydrooxepin ;(+)- 3)除其环氧衍生物罗戈环庚烷B((+)- 4)外通过环氧化物开环衍生自(+)- 4的rogioloxepane C((+)- 5)。同时出现的是无环C 15产乙酸原素,perrogioloxepane(=(7 R,4 Z,9 Z,12Z)-6-chloropentadeca-3,9,12-trien-1-yn-7-ol; 9),其优选以需要的折叠构象存在,以通过分子内环化产生其偏爱的旋转椅形式的罗格洛环烷A(3TC)。分子力学计算支持这一观点