33186-14-0Relevant articles and documents
N-Iodosuccinimide mediated intramolecular oxidative C(sp 2)-S bond formation for the synthesis of 2-aminobenzothiazole derivatives
Jichkar, Atul A.,Opai, Imran A.,Karade, Nandkishor N.
, p. 144 - 155 (2021/10/21)
An extremely efficient synthetic method for the preparation of 2-aminobenzothiazole derivatives starting from arylthioureas by using N-iodosuccinimide has been reported. This protocol features a mild reaction conditions, a short reaction time, and metal-free oxidative conditions for C (sp 2)-S bond construction.
Eosin y catalyzed visible-light-promoted aerobic oxidative cyclization of 2-aminobenzothiazole
Srivastava, Vishal,Singh, Pravin K.,Singh, Praveen P.
, p. 227 - 233 (2016/01/20)
A mild and efficient one-pot visible light irradiated synthesis of 2-aminobenzothiazole 4(a-l) from arylisothiocyanate 1(a-l) and secondary amines 2 have been reported in presence of eosin Y as an organophotoredox catalyst at room temperature under aerobi
Cu(ii) catalysed chemoselective oxidative transformation of thiourea to thioamidoguanidine/2-aminobenzothiazole
Sahoo, Santosh K.,Khatun, Nilufa,Gogoi, Anupal,Deb, Arghya,Patel, Bhisma K.
, p. 438 - 446 (2013/04/10)
2-Haloaryl-sec-alkyl unsymmetrical thioureas (Tu) (halo = -F, -Cl) with a catalytic amount of Cu(ii) salt get oxidised in situ to their disulfide intermediates followed by an imine-disulfide rearrangement to give thioamidoguanidino (Tag) moieties at room temperature. During this process Cu(ii) gets reduced to Cu(i) and forms a complex with the Tag moiety from which Tag moiety can be isolated upon treatment with ammonia. However, when the same reaction was performed at an elevated temperature with a catalytic quantity of Cu(ii) salt, Tu bearing o-halogens (-F, -Cl) gave 2-aminobenzothiazoles via a dehalogenative heteroarylation path and not by the Hugerschoff path involving an electrophilic substitution reaction. For thioureas containing reactive ortho halogens (such as -Br, -I) the reaction proceeds at room temperature giving 2-aminobenzothiazoles via a dehalogenative path requiring a catalytic quantity of Cu(ii). No transformation of thiourea (Tu) to Tag was observed with Cu(i) salts suggesting the requirement of an oxidising Cu(ii) salt for this oxidative transformation. Mild reaction conditions, environmentally benign reagents and solvent, high yields, tolerance of various functional groups are some of the essential features of this methodology.
