Synthesis of a new ketone and alcohol with C2 symmetry; (S,S,S,S) tricyclo[6.3.0.03,7]undecan-2-onela and (S,S,S,S) tricyclo[6.3.0.03,7]undecan-2-ollb
摘要:
Dissolving metal reduction of known enone 5 affords predominantly the racemic form of title ketone (3) whereas catalytic reduction gives the meso isomer 6. Neither ketone 3 nor alcohol 4 could be satisfactorily resolved. Asymmetric synthesis of (-)-3 and (+)-4 (ee = 91%) was effected from ketone (+)-13.
Fused ring systems, containing two or three five-membered rings, were constructed by utilizing 1-(cyclopent-1-enylcarbonyl)vinylphosphonates which function as versatile annulating reagents.
Reaction of an enaminone with 1-nitrocyclopentene: synthesis of a triquinane
作者:Melanie M. Cooper、John W. Huffman
DOI:10.1039/c39870000348
日期:——
A convergent synthesis of a functionalized triquinane is reported which proceeds in three steps and 72% yield from 2-(1-pyrrolidino)cyclohex-2-en-1-one and 1-nitrocyclopentene.
Synthesis of tricyclo[6.3.0.02,6]undec-2(6)-en-7-one from the corresponding spirolactone using zeolite. Use of the zeolite as a microreaction vessel
作者:R. Sreekumar、Y. V. S. Narayana Murthy、C. Narayana Pillai
DOI:10.1039/c39920001624
日期:——
Spirolactone 1 is converted into the tricyclic enone 2 by adsorbing the reactant onto a zeolite and carrying out the reaction inside the zeolite pores; the product is recovered by extraction with methanol.