On the First Marine Stigmastane Sterols and Sterones Having a 24,25-Double Bond. Isolation from the SpongeStelletta sp. of Deep Coral Sea
作者:Antonio Guerriero、C�cile Debitus、Francesco Pietra
DOI:10.1002/hlca.19910740304
日期:1991.5.2
The sponge Stelletta sp. (Astrophorida, Stellettidae), collected at −700 m in the Coral Sea, is shown to contain sterones and sterols of the stigmastane type with a C(24)C(25) bond for which there is no precedent in the sea. Structure elucidation of the second abundant of these steroids, stigmasta-4,24(25)-dien-3-one ((+)-1), is based on 1D and 2D NMR spectra and chemical transformation to acetate
海绵Stelletta sp。(Astrophorida,Stellettidae),收集于珊瑚海的-700 m处,显示含有甾烷类和甾烷类固醇,具有C(24)C(25)键,在海洋中尚无先例。基于1D和2D NMR光谱以及对乙酸盐(-)- 5的化学转化,对第二类固醇stigmasta-4,24(25)-dien-3-one((+)- 1)进行结构解析。痕量存在于海绵中的Stigmasta-4,24(25)-diene-3,6-dione((-)- 3)的存在量足以用于NMR研究,方法是将存在于海绵中的,不可分离的和进行氧化stigmasta-5,24(25)-dien-3β-ol(6)及其5,6-二氢衍生物7(方案1)。该氧化还提供了可以分离的酮类似物(+)- 8和(+)- 9,因此使得阐明结构成为可能。海绵中也存在痕量的6β-hydroxystigmasta-4,24(25)-dien-3-one((+)-