中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
3,3-二甲基1,5-二氧杂螺[5.5]十一烷 | 3,3-dimethyl-1,5-dioxa-spiro[5.5]undecane | 707-29-9 | C11H20O2 | 184.279 |
3,3,9,9-Tetramethyl-1,5,7,11-tetraoxaspiro[5.5]undecane is introduced as a new, stable and chemoselective reagent for the protection of aldehydes and ketones under mild reaction condition in high yield.
Upon reaction with an excess of 2,2-dimethylpropane-1,3-diol (neopentyl glycol) under acid catalysis, estrones form 17-O-[2′,2′-dimethyl-2′-(5″,5″-dimethyl-1″,3″-dioxanyl)ethyl] substituted estra-3, 17β-diols. The reaction represents a formal reduction of a keto function under acidic conditions in the absence of a metal.