A Convenient 3-Step Synthesis of (<i>R</i>)<i>-</i>7<i>-</i>Hydroxycarvone from (<i>S</i>)-α-Pinene
作者:Rajamma Lakshmi、T. David Bateman、Matthias C. McIntosh
DOI:10.1021/jo050217h
日期:2005.6.1
A convenient 3-step synthesis of (R)-7-hydroxycarvone (2) has been developed starting from (S)-α-pinene (7), using photooxygenation, oxidation, and fragmentation reactions. An improved synthesis of epoxy alcohol 6 and an unusual Ti(OiPr)4 catalyzed hydroxy epoxide to keto alcohol rearrangement are also described.
natural products, is described. Optimization of the reaction conditions for photooxygenation and migration of (S)-α-pinene 2, tetrapropylammonium perruthenate (TPAP) oxidation of the generated alcohol, and a subsequent ring-opening reaction in the presence of Cu(OTf)2 led to the synthesis of 1 with good reproducibility. The desired product 1 was thus obtained in 46% yield over three steps.
Asymmetric synthesis of a versatile 1,2,3-trisubstituted cyclopentane synthetic building block
作者:Taehwan Hwang、John L. Wood
DOI:10.1016/j.tet.2023.133384
日期:2023.5
Described herein is an asymmetricsynthesis of a functionalized 1,2,3-trisubstituted cyclopentane buildingblock, derivatives of which are commonly found in numerous natural products. Key steps include a Lewis acid-mediated cyclobutane ring opening, a diastereoselective chlorination, and a Favorskii rearrangement.