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通过与重氮甲烷反应,生成硼烷、硼酸和硼酸酯的大体积衍生物。

Bulky derivatives of boranes, boronic acids and boronate esters via reaction with diazomethanes.

机构信息

Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada.

出版信息

Dalton Trans. 2013 Jan 21;42(3):726-36. doi: 10.1039/c2dt31868g.

DOI:10.1039/c2dt31868g
PMID:23060040
Abstract

Reactions of the perfluoroarylboranes RB(C(6)F(5))(2) (R = C(6)F(5), Ph, Cl, OC(6)F(5)) with Me(3)SiCH(N(2)), (C(6)F(5))CH(N(2)) or Ph(2)C(N(2)) yield (C(6)F(5))(2)B(Me(3)SiCH(C(6)F(5))) 1, (C(6)F(5))B(Me(3)SiCH(C(6)F(5)))(2) 2, (C(6)F(5))B(Me(3)SiCH(C(6)F(5)))(Me(3)SiCH(C(6)H(5))) 3, (C(6)F(5))(2)B(CH(C(6)F(5))(2)) 4, ClB(C(6)F(5))(Ph(2)C(C(6)F(5))) 5 and (C(6)F(5)O)B(C(6)F(5))(Me(3)SiCH(C(6)F(5))) 6 as a result of single or double insertion of a Me(3)SiCH, C(6)F(5)CH or Ph(2)C fragment into a B-C bond of the respective borane. Reactions of one or two equivalents of ethyl α-diazomethylacetate with B(C(6)F(5))(3) yielded (Me)(C(6)F(5))(C=C)(OC(2)H(5))(OB(C(6)F(5))(2)) 8 and (Me)(C(6)F(5))(C=C)(OC(2)H(5))(O(2)B(C(6)F(5))) 9, in addition to the corresponding pyridine adducts (Me)(C(6)F(5))(C=C)(OC(2)H(5))(OB(C(6)F(5))(2))(py) 10 and (Me)(C(6)F(5))(C=C)(OC(2)H(5))(O(2)B(C(6)F(5)))(py) 11. Similarly, reaction of α-diazomethylacetate with BPh(3) yielded analogous products of borane reorganization, (Me)(C(6)H(5))(C=C)(OC(2)H(5))(OBPh(2)) 12 and was isolated as a mixture of E and Z-isomers whereas BPh(3) reacts with Me(3)SiCH(N(2)) and pyridine yielding (py)B(Ph(2)(Me(3)SiCH(Ph)) 7. Reactions of Ph(2)C(N(2)) with RB(OH)(2) (R = C(6)F(5), p-F-C(6)H(4), C(6)H(5)) yielded cyclic boroxines of the form Ph(2)C(R)BO (R = C(6)F(5) 13, p-FC(6)H(4) 14, C(6)H(5) 15) while reactions of the boronate esters (C(6)H(4)O(2))BR (R = C(6)F(5), p-F-C(6)H(4)) with three or five equivalents of Me(3)SiCH(N(2)) yielded (C(6)H(4)O(2))B(Me(3)SiCH(Ar)) (Ar = C(6)F(5) 16, p-F-C(6)H(4) 17) and [(Py)B(C(6)H(4)O(2))(Me(3)SiCH(Ar))] (Ar = C(6)F(5) 18, p-F-C(6)H(4), 19) upon complexation with pyridine. Reaction of HBCat and ClBCat with Ph(2)C(N(2)) yielded the products of B-H and B-Cl bond derivatization (C(6)H(4)O(2))B(Ph(2)CR) (R = H 20, Cl 21), while the triethylphosphine oxide adduct (Et(3)PO)B(C(6)H(4)O(2))(CPh(2)Cl) 22, is readily isolable.

摘要

三氟甲基硼烷(RB(C(6)F(5))(2)(R = C(6)F(5),Ph,Cl,OC(6)F(5))与 Me(3)SiCH(N(2))、(C(6)F(5))CH(N(2))或 Ph(2)C(N(2))反应生成(C(6)F(5))(2)B(Me(3)SiCH(C(6)F(5)))1、(C(6)F(5))B(Me(3)SiCH(C(6)F(5)))(2)2、(C(6)F(5))B(Me(3)SiCH(C(6)F(5)))(Me(3)SiCH(C(6)H(5)))3、(C(6)F(5))(2)B(CH(C(6)F(5))(2))4、ClB(C(6)F(5))(Ph(2)C(C(6)F(5)))5 和(C(6)F(5)O)B(C(6)F(5))(Me(3)SiCH(C(6)F(5)))6,这是由于 Me(3)SiCH、C(6)F(5)CH 或 Ph(2)C 片段插入各自的硼烷的 B-C 键中单或双插入的结果。与 B(C(6)F(5))(3)反应一当量或两当量的乙基 α-二甲基乙酰基酯,生成(Me)(C(6)F(5))(C=C)(OC(2)H(5))(OB(C(6)F(5))(2))8 和[(Me)(C(6)F(5))(C=C)(OC(2)H(5))](2)(O(2)B(C(6)F(5)))9,以及相应的吡啶加合物(Me)(C(6)F(5))(C=C)(OC(2)H(5))(OB(C(6)F(5))(2))(py)10 和[(Me)(C(6)F(5))(C=C)(OC(2)H(5))](2)(O(2)B(C(6)F(5)))(py)11。同样,α-二甲基乙酰基酯与 BPh(3)反应生成硼烷重排的类似产物,(Me)(C(6)H(5))(C=C)(OC(2)H(5))(OBPh(2))12,并且被分离为 E 和 Z-异构体的混合物,而 BPh(3)与 Me(3)SiCH(N(2))和吡啶反应生成(py)B(Ph(2)(Me(3)SiCH(Ph))7。Ph(2)C(N(2))与 RB(OH)(2)(R = C(6)F(5),p-F-C(6)H(4),C(6)H(5))反应生成形式为[Ph(2)C(R)BO](3)的环状硼氧烷(R = C(6)F(5)13、p-FC(6)H(4)14、C(6)H(5)15),而硼酸盐酯(C(6)H(4)O(2))BR(R = C(6)F(5),p-F-C(6)H(4))与三当量或五当量的 Me(3)SiCH(N(2))反应生成(C(6)H(4)O(2))B(Me(3)SiCH(Ar))(Ar = C(6)F(5)16、p-F-C(6)H(4)17)和[(Py)B(C(6)H(4)O(2))(Me(3)SiCH(Ar)](Ar = C(6)F(5)18、p-F-C(6)H(4)、19)与吡啶络合后。HBCat 和 ClBCat 与 Ph(2)C(N(2))反应生成 B-H 和 B-Cl 键衍生化产物(C(6)H(4)O(2))B(Ph(2)CR)(R = H 20、Cl 21),而三乙基氧化膦加合物(Et(3)PO)B(C(6)H(4)O(2))(CPh(2)Cl)22 则易于分离。

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