金属卟啉(和卟啉)是众所周知的自然界生命色素,因为该组的代表包括叶绿素(镁卟啉)和血红素(铁卟啉)。因此,基于这些物质的化学构建可以基于对生物系统的模仿。受大自然的启发,在本文中我们介绍了五种不同卟啉的制备方法,即内消旋四苯基卟啉( TPP )、内消旋四(对茴香基)卟啉( T p AP )、内消旋四(对磺基苯基)卟啉四钠( TST) p SPP )、内消旋-四(间羟基苯基)卟啉 ( T m HPP ) 和内消旋-四(间羧基苯基)卟啉 ( T m CPP ) 以及它们的N-钳形 Pd(II) 配合物,例如 Pd (II)-内消旋-四苯基卟啉 ( PdTPP )、Pd(II)-内消旋-四(对茴香基)卟啉 ( PdT p AP )、Pd(II)-内消旋-四(对磺基苯基)卟啉四钠 ( PdTST p SPP )、Pd(II)-内消旋-四(间羟基苯基)卟啉( PdT m HPP )和Pd(II)-内消旋-四(间羧苯基)卟啉(
Concise Total Synthesis and Stereochemical Revision of (+)-Naseseazines A and B: Regioselective Arylative Dimerization of Diketopiperazine Alkaloids
作者:Justin Kim、Mohammad Movassaghi
DOI:10.1021/ja206743v
日期:2011.9.28
Concise and enantioselective total syntheses of (+)-naseseazines A and B are described. Our regioselective and directed dimerization of diketopiperazines provides their critical C3-C(sp(2)) linkages, an assembly with plausible biogenetic relevance. We revise the absolute stereochemistry of (+)-naseseazines A and B.
描述了 (+)-naseseazines A 和 B 的简洁和对映选择性全合成。我们对二酮哌嗪的区域选择性和定向二聚化提供了其关键的 C3-C(sp(2)) 链接,这是一个具有合理生物遗传相关性的程序集。我们修改了 (+)-naseseazines A 和 B 的绝对立体化学。
α-Phosphonovinyl Arylsulfonates: An Attractive Partner for the Synthesis of α-Substituted Vinylphosphonates through Palladium-Catalyzed Suzuki Reactions
A new and attractive coupling partner for the synthesis of α‐substituted vinylphosphonates through Suzuki reactions has been developed. The developed O‐centered electrophiles couple with various organoboron reagents to give α‐substituted vinylphosphonates in moderate to excellent yields. This protocol features broad substrate scope, mild conditions, and high efficiency.
<sup>1</sup>
H, <sup>13</sup>
C, <sup>19</sup>
F and <sup>11</sup>
B NMR spectral reference data of some potassium organotrifluoroborates
作者:Roberta A. Oliveira、Ricardo O. Silva、Gary A. Molander、Paulo H. Menezes
DOI:10.1002/mrc.2467
日期:2009.10
Complete (1)H, (13)C, (19)F and (11)BNMRspectraldata for 28 potassiumorganotrifluoroborates are described. The resonance for the carbon bearing the boron atom is described for most of the studied compounds. A modified (11)BNMR pulse sequence was used and better resolution was observed allowing the observation of (11)B-(19)F coupling constants for some of the studied compounds.
Photoinduced 1,2-dicarbofunctionalization of alkenes with organotrifluoroborate nucleophiles <i>via</i> radical/polar crossover
作者:María Jesús Cabrera-Afonso、Anasheh Sookezian、Shorouk O. Badir、Mirna El Khatib、Gary A. Molander
DOI:10.1039/d1sc02547c
日期:——
postulated to proceed throughphotochemicalradical/polar crossover to afford a key carbocation species that undergoes subsequent trapping with organoboron nucleophiles to accomplish the carboallylation, carboalkenylation, carboalkynylation, and carboarylation of alkenes with regio- and chemoselective control. The mechanistic intricacies of this difunctionalization were elucidated through Stern–Volmer quenching
Synthesis of 2-Aryl- and 2,5-Diarylfurans and Thiophenes by Suzuki - Miyaura Reactions Using Potassium Trifluoroborate Salts and Heteroaryltellurides
作者:Giancarlo V. Botteselle、Thomas L. S. Hough、Raphael C. Venturoso、Rodrigo Cella、Adriano S. Vieira、Helio A. Stefani
DOI:10.1071/ch08255
日期:——
The Suzuki–Miyaura cross-coupling reaction of 2-(butyltellanyl) or 2,5-bis-(butyltellanyl)furans and thiophenes with potassium aryltrifluoroborate salts catalyzed by palladium afforded 2-aryl- or 2,5-diaryl-furans and thiophenes in moderate to good yields.