Desulfinylation of Ag(I) Sulfinyl Mesoionic Carbenes: Preparation of C-Unsubstituted Au(I)–1,2,3-Triazole Carbene Complexes
摘要:
New and well-characterized Ag-bis(1,2,3-triazolylidene) complexes having enantiopure (S)-sulfoxides upon sequential sequential treatment with alcohols and Au(I) form separable mixtures of regioisomeric C-unsubstituted Au-1,2,3-triazolylidene complexes. Mechanistic studies and DFT calculations support a desulfinylation process for in situ generated free triazolylidene salts.
Carbocupration/Zinc Carbenoid Homologation and β-Elimination Reactions for a New Synthesis of Allenes − Application to the Enantioselective Synthesis of Chiral Allenes by Deracemization of sp3-Organometallic Derivatives
作者:Jos P. Varghese、Irena Zouev、Lionel Aufauvre、Paul Knochel、Ilan Marek
straightforward carbocupration/zinc homologation/β-elimination reaction sequence allows the one-pot synthesis of polysubstituted allenes from acetylenic sulfoxides in excellent isolated chemical yields. Secondary zinccarbenoids were used for the homologation reaction, and so a new synthesis of 1,1-diiodoalkanes is described. This methodology also allows the synthesis of chiral allenes through thermodynamic
with 1-alkynyl sulfoxide as a sulfinyl source was developed. Bis-sulfinyl alkenes were formed in good yields on treatment of 1-alkynyl sulfoxides with Et(2)Zn in the presence of a Pd-catalyst, wherein zinc sulfenate (or sulfinylzinc) species would be generated in situ to undergo highly syn-selective conjugate addition to the 1-alkynyl sulfoxides. By using 3,3-dimethyl-1-butynyl sulfoxides, formation of
Central (S) to Central (M=Ir, Rh) to Planar (Metallocene, M=Fe, Ru) Chirality Transfer Using Sulfoxide‐Substituted Mesoionic Carbene Ligands: Synthesis of Bimetallic Planar Chiral Metallocenes
作者:Marta G. Avello、María C. Torre、Miguel A. Sierra、Heinz Gornitzka、Catherine Hemmert
DOI:10.1002/chem.201902102
日期:2019.10.17
carbene (MIC) ligand coordinated to a metal (Ir, Rh) was transferred through the formation of bimetalliccomplexes having a chiral-at-metal center and a planar chiral metallocene by C-H activation of the sandwich moiety (M=Fe, Ru). The sense of the planar chirality formed in this sequence of reactions depended on the nature of the ligands at the metal center of the starting complex. The configurations of
A short synthesis of the A-Ring of Goniodomin A was developed viaradicalcyclization using vinyl sulfoxide. We found that optically inactive sulfoxides are applicable to the cyclization and Pummerer rearrangement with high stereoselectivity.
通过使用乙烯基亚砜的自由基环化,开发了 Goniodomin A 的 A 环的短合成。我们发现光学惰性亚砜适用于具有高立体选择性的环化和 Pummerer 重排。
Process for producing organotitanium compound and process for addition reaction
申请人:——
公开号:US20030096996A1
公开(公告)日:2003-05-22
A process for producing an organotitanium compound capable of regioselectively converting a substituted acetylene compound into polysubstituted benzene or polysubstituted pyridine. The process comprises reacting an acetylene compound represented by the formula (1)
1
[where R
1
and R
2
denote a C
1-20
alkyl group or the like] in the presence of a prescribed titanium compound and a Grignard reagent with a compound represented by the formula (4)
2
[where R
3
and R
4
denote a hydrogen atom or the like] and further reacting with a compound represented by the formula (5)
3
[where R
5
denotes a hydrogen atom or the like, Z denotes CR′ (where R′ denotes a hydrogen atom or the like), nitrogen atom, X
6
denotes a halogen atom or the like, and m is 0 or 1]
thereby giving the titanium compound represented by the formula (6) and/or (7).
4
[where R
1
˜R
5
, Z, X
6
, and m are defined as above; and X
p
and X
q
denote any of X
1
˜X
4
].
一种生产有机钛化合物的工艺,该有机钛化合物能够将取代的乙炔化合物选择性地转化为多取代苯或多取代吡啶。该工艺包括使式(1)代表的炔化合物反应
1
其中 R
1
和 R
2
表示一个 C
1-20
烷基或类似物] 在规定的钛化合物和格氏试剂存在下,用式 (4) 代表的化合物
2
其中 R
3
和 R
4
表示氢原子或类似物]并与式 (5) 所代表的化合物进一步反应
3
其中 R
5
表示氢原子或类似物,Z 表示 CR′(其中 R′表示氢原子或类似物)、氮原子、X
6
表示卤素原子或类似原子,m 为 0 或 1]
从而得到式 (6) 和/或 (7) 所代表的钛化合物。
4
其中 R
1
˜R
5
,Z,X
6
和 m 的定义同上;X
p
和 X
q
表示 X
1
˜X
4
].