Synthesis of chiral organotin reagents: synthesis of diphenyl- {(1S,2R,3S,4R)-3-(alkoxymethyl)bicyclo[2.2.1]heptan-2-yl}tin hydrides. X-Ray crystal structure of (R)-4,4-dimethyl-2-oxotetrahydrofuran-3-yl (1S,2S,3R,4R)-3-triphenylstannylbicyclo[2.2.1]hept-5-ene-2-carboxylate
作者:Roy Beddoes、Robert M. Pratt、Eric J. Thomas
DOI:10.1039/a706293a
日期:——
Conditions have been developed for the stereoselective Diels–Alder addition of cyclopentadiene to (R)-4,4-dimethyl-2-oxotetrahydrofuran-3-yl (E)-3-triphenylstannylprop-2-enoate 10 to give the endo-adduct 14 whose structure has been confirmed by X-ray crystallography. The adduct 14 is converted into (1S,2R,3S,4R)-3-hydroxymethylbicyclo[2.2.1]heptan-2-yl(triphenyl)stannane 22 which is shown to have an enantiomeric excess (ee) of 94%. This alcohol has been converted into its methyl ether (–)-3, trityl ether 25, tert-butyldimethylsilyl ether 26 and 1-naphthoate 27 which give the tin hydrides 4, 31–34 on treatment with iodine and sodium borohydride. Aspects of the chemistry of these enantiomerically enriched tin hydrides are briefly discussed.
已经开发出了环戊二烯对(R)-4,4-二甲基-2-氧代四氢呋喃-3-基(E)-3-三苯基锡基丙-2-烯酸酯10进行立体选择性迪尔斯-阿尔德加成的条件,得到了endo-加成物14,其结构已通过X射线晶体学证实。将加成物14转化为(1S,2R,3S,4R)-3-羟甲基双环[2.2.1]庚-2-基(三苯基)锡烷22,其对映体过量(ee)达到94%。将此醇转化为其甲醚(–)-3,三苯甲醚25,叔丁基二甲基硅醚26和1-萘甲酸酯27,在碘和硼氢化钠处理下得到锡氢化物4,31-34。简要讨论了这些对映体富集的锡氢化物的化学特性。