Mesoporous graphitic carbon nitride as a versatile, metal-free catalyst for the cyclisation of functional nitriles and alkynes
作者:Frédéric Goettmann、Anna Fischer、Markus Antonietti、Arne Thomas
DOI:10.1039/b618555j
日期:——
Mesoporous graphitic C3N4 was successfully employed as an effective catalyst for the cyclotrimerisation of various nitriles into triazine derivatives and the cyclisation of functional alkynes.
MeOTf-catalyzed formal [4 + 2] annulations of styrene oxides with alkynes leading to polysubstituted naphthalenes through sequential electrophilic cyclization/ring expansion
作者:Song Zou、Zeyu Zhang、Chao Chen、Chanjuan Xi
DOI:10.1016/j.cclet.2021.12.012
日期:2022.6
MeOTf-catalyzed formal [4 + 2] annulation of styrene oxides with alkynes to afford polysubstituted naphthalenes has been realized, which undergoes sequential electrophiliccyclization/ring expansion. A range of substrates were tolerated in the formation of naphthalene derivatives with high regioselectivity in satisfactory yields. The reaction could also be carried out on gram scale.
reported. The reaction proceeds via the cleavage of a carbon–hydrogen bond at the position ortho to an alkynylgroup, and no additives are needed. Platinum complexes bearing other common ligands, such as phosphines and NHCs, failed to promote this reaction, highlighting the utility of the silylene ligand in this reaction.
Rhodium-Catalyzed Dimerization of Diaryl Acetylenes in the Presence of Grignard Reagents: Synthesis of 1,2,3-Triphenyl Naphthalene Derivatives
作者:Pengcheng Qian、Fan Chen、Changduo Pan
DOI:10.1080/00397911.2011.580444
日期:2012.11
Abstract An efficient Rh-catalyzed dimerization of diaryl acetylenes was achieved in the presence of Wilkinson catalyst, AgF2, and 1.5 equivalent of PhMgBr in toluene, providing the 1,2,3-triaryl naphthalene derivatives in moderate to good yields. Supplemental materials are available for this article. Go to the publisher's online edition of Synthetic Communications to view the free supplemental file
Palladium‐Catalyzed Annulation of 1,2‐Diborylalkenes and ‐Arenes with 1‐Bromo‐2‐[(
<i>Z</i>
)‐2‐bromoethenyl]arenes: A Modular Approach to Multisubstituted Naphthalenes and Fused Phenanthrenes
(Z)‐1,2‐Diaryl‐1,2‐bis(pinacolatoboryl)ethenes underwent double‐cross‐coupling reactions with 1‐bromo‐2‐[(Z)‐2‐bromoethenyl]arenes in the presence of [Pd(PPh3)4] as a catalyst and 3 M aqueous Cs2CO3 as a base in THF at 80 °C. The double‐coupling reaction gave multisubstitutednaphthalenes in good to high yields. Annulation of 1,2‐bis(pinacolatoboryl)arenes with bromo(bromoethenyl)arenes in the presence
(Ž)-1,2-二芳基-1,2-双(频哪醇基硼)ethenes后行双交叉偶联反应用1-溴-2 - [(ż)-2-溴乙烯基]在[钯的存在下芳烃(在80°C下于THF中作为催化剂的PPh 3)4 ]和作为碱的3 M Cs 2 CO 3水溶液。双重偶联反应以良好或高收率得到了多取代萘。在由[Pd 2(dba)3](dba =二亚苄基丙酮)和2-二环己基膦基2',6'-二甲氧基联苯(SPhos)在相同条件下可生产高产量的稠合菲。第一次环偶联发生在溴乙烯基基团区域上。此程序适用于通过使用相应的二溴双[[ Z)-2-溴乙烯基]苯作为二硼烷基偶联伙伴的双环途径轻松合成多取代的蒽,苯并噻吩和二苯并蒽。