Tandem Thermal Reactions for the Synthesis of Jasmonoids
摘要:
AbstractA tandem reaction tactic for the preparation of a jasmonoid intermediate consists of pyrolysis of a spiroannulated cyclopentanone. The thermal decomposition actually involves a retro‐Diels‐Alder reaction and a homo‐1,5‐hydrogen shift with cleavage of the cyclopropane unit.
Lanthanide replacement in organic synthesis: Luche-type reduction of α,β-unsaturated ketones in the presence of calcium triflate
作者:Nina V. Forkel、David A. Henderson、Matthew J. Fuchter
DOI:10.1039/c2gc35619h
日期:——
calcium-mediated regioselective 1,2-reduction of challenging α,β-unsaturated ketones, such as 2-cyclopententone, is reported. The corresponding allylic alcohols are obtained in very good regioselectivities using Ca(OTf)2 and NaBH4. Furthermore, we have shown that our method can stereoselectively reduce aziridinyl ketones.
Aminoborohydrides. 2. Regiospecific reductions of α, β-unsaturated carbonyl compounds with lithium pyrrolidinoborohydride. A facile conversion of α, β-unsaturated aldehydes and ketones to the corresponding allylic alcohols in high purity
作者:Joseph C. Fuller、Eric L. Stangeland、Christian T. Goralski、Bakthan Singaram
DOI:10.1016/s0040-4039(00)60561-0
日期:1993.1
reducing agents for the reduction α, β-unsaturated aldehydes and ketones to the corresponding allylicalcohols. Thus, lithium pyrrolidinoborohydride (LiPyrrBH3) and reduces cinnamaldehyde and cyclohexenone to give exclusively cinnamyl alcohol and 2-cyclohexen-1-ol respectively. This 1, 2-reduction appears to be general and ester groups are tolerated. The yield of allylicalcohols from this procedure is essentially
Aminoborohydrides. 4. The Synthesis and Characterization of Lithium Aminoborohydrides: A New Class of Powerful, Selective, Air-Stable Reducing Agents
作者:Gary B. Fisher、Joseph C. Fuller、John Harrison、Salvador G. Alvarez、Elizabeth R. Burkhardt、Christian T. Goralski、Bakthan Singaram
DOI:10.1021/jo00100a046
日期:1994.10
Lithium aminoborohydrides (LiABH(3)) are a new class of powerful yet selective reducing agents that reproduce, in air, virtually all of the transformations for which lithium aluminum hydride is now used. LiABH(3)'s can be readily prepared as solids or generated in situ, are nonpyrophoric, and liberate hydrogen only slowly with protic solvents above pH 4. LiABH(3)'s can be handled in dry air as easily as sodium borohydride and retain their chemical activity for at least 6 months when stored under nitrogen or dry air at 25 degrees C. LiABH(3)'s can be synthesized from any primary or secondary amine, thus allowing control of the steric and electronic environment of these reagents.