Photooxidations of 2-(γ,ε-Dihydroxyalkyl) Furans in Water: Synthesis of DE-Bicycles of the Pectenotoxins
摘要:
Photooxygenations of 2-(gamma,epsilon-dihydroxyalkyl) furans in H2O followed by in situ reduction and ketalization affords, in one synthetic operation, DE-bicyclic ketals of the pectenotoxins.
2,6‐Dimethyl‐7,8‐dihydro‐4H‐cyclohepta[b]furan and 2,6‐dimethyl‐7,8‐dihydro‐4H‐cyclohepta[b]thiophene were prepared by direct cyclization of 3‐methyl‐5‐(5‐methylfuran‐2‐yl)‐pent‐1‐en‐3‐ol and 3‐methyl‐5‐(5‐methyltiophen‐2‐yl)‐pent‐1‐en‐3‐ol, respectively. J. Heterocyclic Chem., (2009).
2,6-二甲基- 7,8-二氢-4- ħ -环庚[ b ]呋喃和2,6-二甲基-7,8-二氢-4- ħ -环庚[ b ]噻吩通过3-甲基的直接环化来制备分别和3-甲基-5-(5- methyltiophen -2-基) -戊-1-烯-3-醇,-5-(5-甲基呋喃-2-基) -烯-3-醇-戊-1- 。J.杂环化学,(2009)。