已经报道了通过Cu I -Pybox-diPh催化的一锅式胺化-炔基化-氮杂-迈克尔序列对1,3-二取代的异吲哚啉和四氢异喹啉的对映体和非对映体选择性合成。三组分反应在一次操作中依次产生一个C–C和两个C–N键,且产率高(高达92%),对映选择性(高达99%)和非对映选择性(高达9:1)。此外,已经通过LiAlH 4的酯还原和炔烃官能度的氢化而不丧失立体选择性证明了该产品的合成效用。
Tetrahydrothiophene-Catalyzed Synthesis of Benzo[<i>n</i>.1.0] Bicycloalkanes
作者:Long-Wu Ye、Xiu-Li Sun、Chuan-Ying Li、Yong Tang
DOI:10.1021/jo062209m
日期:2007.2.1
A catalytic intramolecular cyclopropanation for the preparation of benzobicycliccompounds with [n.1.0] units has been developed. In the presence of 20 mol % of tetrahydrothiophene, the reactions of compounds 2a−2h afford versatile benzo[n.1.0]bicycloalkanes with excellent stereoselectivity in moderate to good isolated yields.
用于与benzobicyclic化合物的制备的催化分子内环丙烷[ Ñ .1.0]单元已经研制成功。在存在20 mol%的四氢噻吩的情况下,化合物2a - 2h的反应可提供具有良好立体选择性的通用的苯并[ n .1.0]双环烷烃,分离产率中等至良好。
作者:Tong Zhang、Jaro Vanderghinste、Andrea Guidetti、Sabine Van Doorslaer、Giovanni Barcaro、Susanna Monti、Shoubhik Das
DOI:10.1002/anie.202212083
日期:2022.12.5
A novel visible-light-induced reaction for the reductive generation of synthetically important α-amino radicals proceeds via a π-π stacked ionic complex. Multiple π interactions stabilize the reactive intermediate, and neither a photocatalyst nor an initiator are required. This synthetic pathway enabled the synthesis of complex functionalized amines in high yield.
Stereochemical modulation of ketyl radical cyclization enabled by pyridine-boryl radicals: catalytic diastereoselective synthesis of <i>trans</i>-2-alkyl-1-indanols
作者:Somi Kim、Junhyuk Jo、Sunggi Lee、Won-jin Chung
DOI:10.1039/d3cc02248j
日期:——
uncontrollable diastereoselectivity because of the absence of reagent–substrate interactions. In this report, stereochemical modulation was accomplished by taking advantage of the pyridine-boryl radical, which leaves the synthetically modifiable boronate moiety on the carbonyl oxygen near the reacting center during the stereo-determining cyclization step. In consequence, a catalytic diastereoselective synthesis
The synthesis of a porphyrin with a hydrocarbon encapsulated face
作者:Wayne F.K. Schnatter、Örn Almarsson、Thomas C. Bruice
DOI:10.1016/s0040-4020(01)96191-5
日期:1991.10
The uniquely hydrocarbon-like capped porphyrin (C70H68N4), 1i, has been successfully prepared by a high dilution reaction of pyrrole with tetrakis-1,2,4,5-[pentyl-5'-(2"-formylphenyl)]-benzene 1h in the presence of boron trifluoride etherate. The aldehyde 1h was prepared by four simultaneous Wittig condensations of a phosphonium salt, 1e, with 1,2,4,5-tetraformylbenzene, followed by reduction of the double bonds with Raney nickel and deprotection with perchloric acid.