Strained Ketenes from ?-Bromoacyl Phosphates. (Tricyclo[4.4.1.01,6]undeca-3,8-dien-11-ylidene)methanone and its Heptacyclic Dimer: a Dispirobridged Dipropellane (1,1?,4,4?,5,5?,8,8?-Octahydrodispiro[[4a, 8a]methanonaphthalene-9,1?-cyClobutane-3?,9?-[4a, 8a]methanonaphthalene]-2?, 4?-dione)
作者:H. Martin R. Hoffmann、Peter M. Geschwinder、Hans-Peter Hollwege、Angela Walenta
DOI:10.1002/hlca.19880710812
日期:1988.12.14
Dehalogenation of the mixed anhydride 6 of 11-bromotricyclo[4.4.1.01,6] undeca-3,8-diene-11-carboxylic acid (4) and of diethyl hydrogen phosphate with Zn-Ag couple in THF gave the dispiro-fused dipropellane 8(1,1″,4,4″,5,5″,8,8″-octahydrodispiro[[4a, 8a]methanonaphthalene-9,1′-cyclobutane-3′,9″-[4a, 8a]methanonaphthalene]-2′,4′-dione) in 58% yield. Unlike other dispiro[2.1.2.1]octane-4, 8-diones (see
11-溴三环[4.4.1.0 1,6 ]十一碳-3,8-二烯-11-羧酸(4)的混合酸酐6和磷酸二乙酯与Zn-Ag对的脱卤在THF中脱卤,得到双螺并熔双丙炔8(1.1'',4.4'',5.5'',8.8''-八氢双螺[[4a,8a]甲基萘-9,1'-环丁烷3',9''-[4a,8a]甲基萘] -2',4' -二酮),产率58%。与其他双螺[2.1.2.1]辛烷-4、8-二酮(参见2a-e)不同,新的环二聚体8是对O 2敏感的化合物。制备了11-溴双环[4.4.1]十一烷基-1,3,5,7,9-戊烯-11-羧酸(13),并将其转化为酰基磷酸酯14,然后用THF / MeOD中的Zn-Ag对还原,得到氘化的酯16。通过Zn诱导的1-溴环丙烷羧酸和膦酸二乙酯的混合酸酐的还原,可以有利地产生其他二环亚丙基甲烷并使其二聚。