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首页> 外文期刊>Acta Crystallographica Section E: Crystallographic Communications >Investigations into the construction of the penta-substituted ring C of Neosurugatoxin – a crystallographic study
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Investigations into the construction of the penta-substituted ring C of Neosurugatoxin – a crystallographic study

机译:新素体毒素五取代环C的结构研究–晶体学研究

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The crystal structures of three cyclo-penta-[c]furans with various substituents at the 4-, 5- and 6-positions of the ring system are reported, namely, (±)-(3aR,4S,5S,6aS)-4-methyl-5-phenyl-hexa-hydro-1H-cyclo-penta-[c]furan-4,5-diol, C14H18O3, (I), (±)-(3aR,4S,5S,6aS)-4-benz-yloxy-4-methyl-5-phenyl-hexa-hydro-1H-cyclo-penta-[c]furan-5-ol, C21H24O3, (II), and (±)-(1aR,1bS,4aR,5S,5aR)-5-benz-yloxy-5-methyl-5a-phenyl-hexa-hydro-2H-oxireno[2′,3′:3,4]cyclopenta-[1,2-c]furan, C21H22O3, (III). The dominant inter-action in (I) and (II) is an O—H?O hydrogen bond across the bicyclic 5,5-ring system between the non-functionalized hy-droxy group and the tetra-hydro-furan O atom, which appears to influence the envelope conformations of the fused five-membered rings, whereas in (III), the rings have different conformations. A weak intra-molecular C—H?O inter-action appears to influence the degree of tilt of the phenyl ring attached to the 5-position and is different in (I) compared to (II) and (III).
机译:报道了在环系统的4-,5-和6-位具有多个取代基的三个环戊-[c]呋喃的晶体结构,即(±)-(3aR,4S,5S,6aS)- 4-甲基-5-苯基-六氢-1H-环戊-[c]呋喃-4,5-二醇,C14H18O3,(I),(±)-(3aR,4S,5S,6aS)-4 -苯甲酰氧基-4-甲基-5-苯基-六氢-1H-环戊-[c]呋喃-5-醇,C21H24O3,(II)和(±)-(1aR,1bS,4aR, 5S,5aR)-5-苯甲氧基-5-甲基-5a-苯基-六氢-2H-氧杂壬酸[2',3':3,4]环戊-[1,2-c]呋喃,C21H22O3, (III)。 (I)和(II)中的主要相互作用是未官能化的羟基与四氢呋喃O原子之间的双环5,5-环系统中的一个OH?O氢键,这似乎影响稠合五元环的包络构象,而在(III)中,这些环具有不同的构象。弱的CHH分子内相互作用似乎会影响连接在5位上的苯环的倾斜程度,并且在(I)中与(II)和(III)相比有所不同。

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