3-Methyl-4-phenylthio-1-oxaspiro[4.6]undecanes, [4.7]dodecanes, [4.11]hexadecanes and the corresponding 2-ones (lactones) can be made from cyclohepta-, octa-, and dodecanone by chain extension to the 2-phenylthio-carbaldehyde, stereoselective aldol reaction and stereospecific phenylthio migration with control over the relative (3,4-syn or anti) and absolute (R or S at positions 3 and 4) stereochemistry
3-甲基-4-苯基
硫-1-氧杂螺[4.6]
十一烷,[4.7]
十二烷,[4.11]
十六烷和相应的2-酮(内酯)可由环庚-,八-和
十二烷通过扩链而制得。 2-苯
硫基
甲醛,立体选择性羟醛反应和立体定向苯
硫醚迁移,并控制相对(3,4- syn或anti)和绝对(3或4位的R或S)。