trans-7,8-dichlorodispiro[2.0.2.2]octane 3b with magnesium. Stepwise electrophilic additions to 1 of HBr, HI, Br2 and Cl2 were studied. The major products (and yields) from these reactions were: 7-bromodispiro[2.0.2.2]octane 2a (43%), 4-iodo-4,5-ethanospiro[2,3]hexane 4b (ca. 50%); trans-3a (40%); and cis-3b (20%). Free-radical addition of hydrogen bromide to 1 gave an 80% yield of 7-bromodispiro[2.0.2
二螺[2.0.2.2]辛-7-烯1用的debrominatioa合成顺式-和反式-7,8- dibromodispiro [2.0.2.2]
辛烷3A用
LAH通过脱
氯顺-和反式-7,8- dichlorodispiro [2.0.2.2]
辛烷3b与
镁。研究了对1 HBr,HI,Br 2和Cl 2的逐步亲电子加成。这些反应的主要产物(和产率)为:7-
溴二螺[2.0.2.2]辛烷2a(43%),4-
碘-4,5-乙螺[2,3]己烷4b(约50%);和4-
碘-2-5,5-乙螺[2,3]己烷4b。反式- 3A(40%);与顺式-图3b(20%)。将
溴化氢自由基加成到1中可得到80%的7-
溴二螺并[2.0.2.2]
辛烷2a。在-10°下,发现
硼氢化氧化为1,主要在大约20℃下得到7-羟基二螺并[2.0.2.2]
辛烷2a。90%的产率;在25°下,获得接近等量的2c和4-(2-羟乙基)螺[2.3]己-4-烯14。