The stereochemically controlled synthesis of spirocyclic ethers and lactones with medium-sized (7-, 8-, and 12-membered) carbocyclic rings by phenylthio migration: 1-oxaspiro[4.n]alkanes and alkan-2-ones with n = 6, 7, and 11.
作者:Kelly Chibale、Richard C. Hartley、Kevin P. Jenkins、Matthew Simons、Stuart Warren、Ian C. Richards
DOI:10.1016/s0040-4039(00)61701-x
日期:1993.10
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)。