观察到铬和钨的烷氧基卡宾和硫代卡宾络合物的反应存在显着差异。因此,由[(OC)5 W C(OEt)CH 2 R](7a - c ; R = n -Pr,Me,c -C 7 H 7原位生成(β-亚氨基)乙氧基卡宾络合物10a - e)和亚氨酰氯R 1 ClC NCHR 2 R 3(9a - f ; R 1 = t- Bu,Ph,2-呋喃基; R 2 = H,Me; R 3= Me,Et,Ph),经历了金属(二-π-甲烷)重排,生成(N-烯氨基)乙氧基卡宾络合物12a - e,而相应的(β-亚氨基)硫代卡宾络合物11a - l衍生自[(OC )5 M C(SEt)CH 2 R](8a - e ; M = W,Cr; R = n -Pr,Me,c -C 7 H 7,c -C 6 H 7 Fe(CO)3)和亚氨酰氯在相似条件下形成吡咯16a - h和通过α-环化得到的17k,l。具体的反应通道的计算DFT
Organic Syntheses via Transition-Metal Complexes. 119.<sup>1</sup> α-Methylenation and α-Alkenylation of α,β-Unsaturated Amides by Means of Carbene Tungsten Complexes: A Novel Baylis−Hillman Type Reaction
Fischer carbene complexes were found to undergo Baylis−Hillman type additions to α,β-unsaturated acidamides. Reactions of (non-CH-acidic) carbene tungsten complexes 1a−c with (CH-acidic) but-2-enoic acidamides 2 in the presence of POCl3/Et3N resulted in an α-addition of the carbene ligand to the amide backbone and formation of cross-conjugated aminocarbenecomplexes 3. Reaction of CH-acidic carbene
发现费歇尔卡宾络合物在α,β-不饱和酰胺中经历了Baylis-Hillman类型的加成反应。在POCl 3 / Et 3 N存在下,(非CH酸性)卡宾钨配合物1a - c与(CH酸性)丁-2-烯酰胺2的反应导致卡宾配体的α加成反应酰胺主链和交叉共轭氨基卡宾配合物的形成3。CH的反应-酸性卡宾络合物钨1D - ħ得到交叉共轭aminocarbene络合物9(其是这样的化合物的双键异构体3)与(环丁烯基)卡宾配合物10分别通过α-和β加成到丁-2-烯酰胺2上。化合物9和10是化合价异构体,但它们不会发生热互变。
Organic Syntheses via Transition Metal Complexes. 116.<sup>1</sup> Carbocyclic Four-, Five-, and Six-Membered Rings by Condensation of (Alkyl,ethoxy)carbene Complexes (M = W, Cr) with α,β-Unsaturated Tertiary Acid Amides
(cyclohexan-4-on-1-yl)carbene tungsten complexes 6 were obtained by condensation of (ethoxy,methyl)carbene tungsten complex (OC)5WC(OEt)CH3 1a with α,β-unsaturated tertiary acid amides PhCHCHC(O)NR2 7 in the presence of POCl3/Et3N and (COCl)2/Et3N, respectively. Compounds 2 underwent a π-cyclization to zwitterionic η1-cyclopentadiene complexes 3. Condensation of (prim-alkyl,ethoxy)carbenecomplexes (CO)5MC(OEt)CH2R1
4-氨基-1-钨-1,3,5-己三烯(CO)5 W C(OEt)CH C(NR 2)CH CHPh(3 E)-2和(环己基4-on-1-基)卡宾钨配合物6是通过在(乙氧基,甲基)卡宾钨配合物(OC)5 W C(OEt)CH 3 1a与α,β-不饱和叔酰胺PhCh CHC(O)NR 2 7的缩合反应中获得的。将POCl 3 / ET 3 N和(氯化钴)2 / ET 3 N,分别。化合物2经历了π-环化,两性离子η 1-环戊二烯配合物3。的缩合(整洁-烷基,乙氧基)卡宾配合物(CO)5中号C(OET)CH 2 - [R 1 1(M = W,铬; R 1 = C ^ -C 7 ħ 7,Ñ -Pr)用化合物7,得到(环丁烯基)卡宾络合物9。