US 12,410,158 B2
Process for preparing anthranilic diamides and intermediates thereof
Alexander Klausener, Pulheim (DE); Shrikant Bhausaheb Kanawade, Nashik-Maharashtra (IN); Vijay Kumar Salvi, Udaipur-Rajasthan (IN); Suresh Kumar Sythana, Rajendra Nagar-Hyderabad (IN); Yuvraj Navnath Kale, Dist-Ahmednagar-Maharashtra (IN); Pramod Subhash Nagle, Jalgaon-Maharashtra (IN); and Deepak Shankar Panmand, Dist: Ahmednagar-Maharashtra (IN)
Assigned to PI INDUSTRIES LTD., Udaipur-Rajasthan (IN)
Appl. No. 17/310,673
Filed by PI INDUSTRIES LTD., Udaipur-Rajasthan (IN)
PCT Filed Feb. 14, 2020, PCT No. PCT/IB2020/051227
§ 371(c)(1), (2) Date Aug. 17, 2021,
PCT Pub. No. WO2020/170092, PCT Pub. Date Aug. 27, 2020.
Claims priority of application No. 201911006381 (IN), filed on Feb. 18, 2019.
Prior Publication US 2022/0144814 A1, May 12, 2022
Int. Cl. C07D 409/12 (2006.01); C07D 231/14 (2006.01); C07D 403/06 (2006.01)
CPC C07D 409/12 (2013.01) [C07D 231/14 (2013.01); C07D 403/06 (2013.01)] 17 Claims
 
1. A single step and single pot process for preparing a compound of Formula V, wherein the process comprises a step (b) of:
oxidizing and halogenating the dione of Formula II simultaneously into an isatoic anhydride of Formula V using at least one oxidizing reagent and at least one halogenating reagent in the presence of at least one suitable acid;

OG Complex Work Unit Chemistry
wherein, R1 is CH3, Br or Cl;
R2 is F, Cl, Br, or I;
and
R3c is independently H or C1-C4 alkyl.